[PATCH 1/1] device-dax: Correct pgoff align in dax_set_mapping()
From: Kun(llfl)
Date: Fri Sep 27 2024 - 03:45:53 EST
pgoff should be aligned using ALIGN_DOWN() instead of ALIGN(). Otherwise,
vmf->address not aligned to fault_size will be aligned to the next
alignment, that can result in memory failure getting the wrong address.
Fixes: b9b5777f09be ("device-dax: use ALIGN() for determining pgoff")
Signed-off-by: Kun(llfl) <llfl@xxxxxxxxxxxxxxxxx>
Tested-by: JianXiong Zhao <zhaojianxiong.zjx@xxxxxxxxxxxxxxx>
---
drivers/dax/device.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 9c1a729cd77e..6d74e62bbee0 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -86,7 +86,7 @@ static void dax_set_mapping(struct vm_fault *vmf, pfn_t pfn,
nr_pages = 1;
pgoff = linear_page_index(vmf->vma,
- ALIGN(vmf->address, fault_size));
+ ALIGN_DOWN(vmf->address, fault_size));
for (i = 0; i < nr_pages; i++) {
struct page *page = pfn_to_page(pfn_t_to_pfn(pfn) + i);
--
2.43.0